Illegal Sustitution

[STEVED21]

I worked a playoff game last week when the following occured:

About 1:39 left in game. Score B 13- A 10. 2nd and 8 on the B13. A in hurry up. A comes to line and A2(split end) lines up about two feet outside the numbers. He did not come from the bench and was involved in the prior play. The R holds the RFP for about 3-5 seconds after A is in position for the snap. I was on the line. The play goes off and R throws flag for Ill Sub (not inside #'s) I passed on the call as I felt he was close enough and no deception was involved. BTW the play started on my hash. The play went for 10yds over the middle and did not invove the WR at all. What do you guys think?